Comprehensive protocol design and distributed systems interview questions covering networking, communication protocols, and distributed consensus. Network Protocols Interview questions covering fundamental and advanced networking concepts: Easy: OSI model, TCP vs UDP, DNS, HTTP, REST APIs, WebSocket, authentication …

Easy-level protocol and design interview questions covering fundamental concepts. Q1: What is a network protocol and why is it important? Answer: Definition: A set of rules and conventions for communication between network entities. Why Important: Standardization: Different systems can communicate Interoperability: …

Basic Navigation 1# Enter privileged EXEC mode 2enable 3 4# Enter global configuration mode 5configure terminal 6 7# Exit to previous mode 8exit 9 10# Exit to privileged EXEC 11end 12 13# Show current mode 14# (indicated by prompt: > user, # privileged, (config)# global config) Configuration Modes 1# Global …

DNS fundamentals and practical configuration for common services like Gmail and GitHub Pages. DNS Basics DNS Record Types Record Purpose Example A IPv4 address example.com → 192.0.2.1 AAAA IPv6 address example.com → 2001:db8::1 CNAME Alias to another domain www.example.com → example.com MX Mail server example.com → …

Real-time network bandwidth monitoring with iftop. Basic Usage Monitor Default Interface 1# Monitor default network interface 2sudo iftop 3 4# Monitor specific interface 5sudo iftop -i eth0 6 7# Monitor wireless interface 8sudo iftop -i wlan0 Display Options Filter by Host 1# Show traffic to/from specific host 2sudo …